Depends entirely on the screen and its scanning frequency. Check in your manual regarding the syncro scan function:
SYNCRO SCAN
(Camera)
Adjusts the synchro scan shutter speed used for shooting images on a TV screen, etc.
Holding the Operation lever toward the  or  will cause the values to change at a faster rate.
• 60P/60i:
1/60.0…1/249.8 (Factory default setting is 1/48.0)
• 30P: 1/30.0…1/48.0…1/249.8
• 24P: 1/24.0…1/48.0…1/249.8
Noah
Call Box Training.
Featuring the Panasonic GH2 and Panasonic AC160/130.